diff --git a/docs/lecture02.ipynb b/docs/lecture02.ipynb
index dea7db6..0d3dcfa 100644
--- a/docs/lecture02.ipynb
+++ b/docs/lecture02.ipynb
@@ -2271,6 +2271,30 @@
     "plt.show()"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "fig, (ax1, ax2, ax3) = plt.subplots(figsize=(12, 4), ncols=3)\n",
+    "fig.suptitle(\"1D histogram of $s_{12}, s_{23}$, and $s_{31}$\")\n",
+    "ax1.hist(s12, bins=100)\n",
+    "ax1.set_xlabel(R\"$s_{12}$\")\n",
+    "ax1.set_ylabel(\"counts\")\n",
+    "\n",
+    "ax2.hist(s23, bins=100)\n",
+    "ax2.set_xlabel(R\"$s_{23}$\")\n",
+    "ax2.set_ylabel(\"counts\")\n",
+    "\n",
+    "ax3.hist(s31, bins=100)\n",
+    "ax3.set_xlabel(R\"$s_{31}$\")\n",
+    "ax3.set_ylabel(\"counts\")\n",
+    "\n",
+    "fig.tight_layout()\n",
+    "plt.show()"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -2556,6 +2580,30 @@
     "fig.tight_layout()\n",
     "plt.show()"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "fig, (ax1, ax2, ax3) = plt.subplots(figsize=(12, 4), ncols=3)\n",
+    "fig.suptitle(\"1D histogram of $s_{12}, s_{23}$, and $s_{31}$\")\n",
+    "ax1.hist(s12, bins=100)\n",
+    "ax1.set_xlabel(R\"$s_{12}$\")\n",
+    "ax1.set_ylabel(\"counts\")\n",
+    "\n",
+    "ax2.hist(s23, bins=100)\n",
+    "ax2.set_xlabel(R\"$s_{23}$\")\n",
+    "ax2.set_ylabel(\"counts\")\n",
+    "\n",
+    "ax3.hist(s31, bins=100)\n",
+    "ax3.set_xlabel(R\"$s_{31}$\")\n",
+    "ax3.set_ylabel(\"counts\")\n",
+    "\n",
+    "fig.tight_layout()\n",
+    "plt.show()"
+   ]
   }
  ],
  "metadata": {